Scott:
Here is some good info. that Jamie gave me when trying to decide on an Ion (in addition – the Virga – which I also have – was discussed and compared)
I might be able to give some thoughts on the Ion and specific to Virga comparison. One thing I have done to my ion to lighten it is remove the sternum strap and remove the hipstrap. The sternum is detachable, but the hipstrap is not so I have sewn in lightweight couplers to the original strap so it can be easily reattached. The ion now weighs 7.15 oz compared to 9.1 oz. I do think the I will need to stick with the virga for sub 40 degree nights though because of the size of sleeping bag needed. On the Virga side I have trimmed all straps and cut down the extension collar by 6" (requires some sewing skills) …my virga weighed heavy compared to manu. spec. and even after removals it is still 20.55 oz. What drove me to look beyond the Virga is my lightest summer load did not come close to filling the virga up. It was simply too large, but not so in winter.
Ion Pros:
Light – 9.1/7.15 oz (not the lightest, but pretty good)
Durable – that gridstop stuff seems stuff, I like lightweight, but also like to have some level of durability.
Simple – one bag thats it
Zipper – this is the one thing I didnt think I would like, but it works surprising well and seems to be fairly waterproof.
Waterproofing – I suspect this pack is more waterproof then most – no real test though
Size – 1500 cubic inches worked great for me, it is a good bit smaller then the virga.
Straps – light but nicely padded
Price – can not beat $50 and if you wait you can find them on sale. I think I paid $39
Cons:
No Outside pockets – you have to unzip the pack to take a drink and wet raingear goes inside. It does have a hydration tube hole though so you could go that route. (pockets would add weight)
No compression system – less of an issue then I thought if you keep the load light and use a sleeping pad coiled to frame it out. The pad works extremely well. I used a Gos. Gear 3/8" thinlight trimmed down to 3.45 oz. Add the end of my trip my pack was underfilled (as in photos), but the sleeping pad kept it plenty rigid.
Things to consider between the 2. First is size, the Virga is considerably larger and if you have a 20oz+ sleeping bag (i.e. for me in winter) the ion will be tight. Also my ion was near full with 2 days of compact food, I could put 1 more day in and thats it. The virga's shoulder straps are better (actually they are awesome), but with even 10 lbs load (gear+food+water) they are not needed. Neither is the wider belt. I really like having the Virga's outside pockets for water bottles. I prefer the virga's drawstring opening especially after cutting down the long collar. For the Virga in winter I use a Montbell 90 self inflating pad for the frame (folded into 1/4 flat then placed against the back of pack for the frame) and attach the GG rolled up vertically to the outside. You can not really attach anything to the outside of the Ion so with this much ground insulation I need the Virga.
In the end I think it comes down to volume of gear. If the overall load is light and fits inside I am sold on the ion…if the volume increases (food or winter gear) then I will use the virga. I must say I love the Virga, but since using the ion I am looking at buying a Jam2 to possibly replace the Virga. But then again I am always looking for something.
One last thing…on sizing…I am 5'9.5" tall and weigh around 155 lbs. The ion medium fit me fine, but if I were any taller I think I would get a large (but it does weigh 1oz more with a bit more volume)
Hope this helps. If I missed anything just ask.